package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;


    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)) {

            //2.如果不符合，则返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.符合就生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.将验证码保存到redis中
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}",code);
        //6.返回ok
        return Result.ok(code);
    }

    /**
     * 登录,注册功能
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            log.info("手机号格式错误！");
        }
        //2.校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+loginForm.getPhone());
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code)) {
            //3.验证码不正确,报错
            return Result.fail("验证码错误！");
        }
        //4.验证码正确，根据手机号查询用户 select * from tb_user where phone = ? 用one()就表明查询一个 list就表明查询的是多个
        User user = query().eq("phone", loginForm.getPhone()).one();
        //5.判断用户是否存在
        if(user == null) {
            //6.不存在，则创建新用户，保存到数据库
            user = createUserWithPhone(loginForm.getPhone());
        }
        //7.存在，保存用户到redis中
        //7.1.随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2.将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //7.3.存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        stringRedisTemplate.expire(token,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
